Electronic delay blasting circuit

Details Electronic delay blasting circuit Electronic delay blasting circuit

1980-05-05

1982-05-11

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

361251, F42C 1106

Patent

active

043287514

ABSTRACT:
An electronic delay blasting cap (10) receives an input signal over leg wires (12, 14). The input signal is passed through a rectifier (16) to produce a D.C. signal on output lines (26, 28). The D.C. signal charges a storage capacitor (32). When the input signal is removed or the wires (12, 14) are opened or shorted, the charge storage capacitor (32) discharges through a resistor (36) to produce a voltage which charges a timing capacitor (38). When the voltage on capacitor (38) reaches the threshold voltage of a zener diode (48) the diode is rendered conductive which in turn activates an SCR (46). A resistive ignition element (44) is connected in series with the SCR (46) and the charge storage capacitor (32) and is ignited when the SCR (46) is turned on. The charge stored in capacitor (32) causes ignition of the ignition element (44).

REFERENCES:
patent: 3206612 (1965-09-01), Swanekamp et al.
patent: 3306208 (1967-02-01), Bergey et al.
patent: 3312869 (1967-04-01), Werner
patent: 3316451 (1967-04-01), Silberman
patent: 3343493 (1967-09-01), Aulds et al.
patent: 3424924 (1969-01-01), Leisinger et al.
patent: 3610153 (1971-10-01), Betts et al.
patent: 3618519 (1971-11-01), Griffith
patent: 3640224 (1972-02-01), Petrick et al.
patent: 4145970 (1979-03-01), Hedberg et al.
patent: 4227461 (1980-10-01), Beezley et al.

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